G8JNJ

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G8JNJ
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  • TDoA background maps not loading

    G8JNJG8JNJ
    >
    >John, is it possible to have the basic (landmass boundaries) maps that TDoA used when I first got my Kiwi last summer?
    >Presumably the multiple TDoAs I do when I TDoA in order to see the… (more)
    Powernumpty

  • Advice on sharing RX antennas with 3 SDRs in the most effective way

    G8JNJG8JNJ
    Be careful regarding some of the commercial active splitters. Their IMD performance is not that good as they often use MMIC chips that can only achieve modest performance.

    For example the Elad unit… (more)
    PowernumptyHB9TMC

  • SAQ 17.2KHz - 30th June 2019

    G8JNJG8JNJ
    Good signals into the UK this morning from SAQ on 17.2KHz using an historic alternator transmitter

    https://alexander.n.se/?lang=en

    15dB above the noise floor into Farnham WEB SDR http://farnham-sdr.… (more)
    PowernumptyKA7USWLJO43

  • SAQ 17.2KHz - 30th June 2019

    G8JNJG8JNJ
    Good signals into the UK this morning from SAQ on 17.2KHz using an historic alternator transmitter

    https://alexander.n.se/?lang=en

    15dB above the noise floor into Farnham WEB SDR http://farnham-sdr.… (more)
    PowernumptyKA7USWLJO43

  • SAQ 17.2KHz - 30th June 2019

    G8JNJG8JNJ
    Good signals into the UK this morning from SAQ on 17.2KHz using an historic alternator transmitter

    https://alexander.n.se/?lang=en

    15dB above the noise floor into Farnham WEB SDR http://farnham-sdr.… (more)
    PowernumptyKA7USWLJO43

  • Wellgood balanced loop amplifier, (Wellbrook clone).

    G8JNJG8JNJ
    Hi John,

    Build the LZ1AQ instead.

    It's a better performer and easier to construct, plus I'm not 100% convinced about George's reverse engineered circuit, especially the transformer windings and… (more)
    KA7U

  • Aricebo - 5125KHz

    G8JNJG8JNJ
    I just realised that I got the project reference incorrect, as I'd worked out the wrong time from the schedule.

    So the final session is now up and running until I estimate 18:00 UTC 14th June 2019

    I… (more)
    HB9TMC

  • RF Pro-1B Issue Developing

    G8JNJG8JNJ
    >
    >I think half the worlds supply of silicone was used to seal every seam and screw.
    >

    So the magic smoke is probably still contained within :-)

    At least you can unpick silicone, go on you know… (more)
    Powernumpty

  • Aricebo - 5125KHz

    G8JNJG8JNJ
    Aricebo was operating again last night, putting a very strong carrier (but with weak 120Hz sidebands) into the UK on 5125KHz.



    It was a LOTstronger into KP4CA http://kp4ca.ddns.net:8073/ in Anasco,… (more)
    Powernumpty

  • QRM: Radio China International - From Albania - OV +++

    G8JNJG8JNJ
    Hi Giulio,

    Adding a series tuned notch filter across the KiWi RF input will help reduce the problems on 7345KHz.



    These values give the bets compromise between notch depth and attenuation on the… (more)
    WA2ZKDIZ3EAWG0LUJ